How do i open the firefox to debug php-script in vim with the map ?

As the topic, i want to debug the php-script of how to do with the map in the
vim,
if the firefox not existing in the current window or process, open it and
send a request by the url of the preceding setting ,
or jump to the firefox to executing an action of the flash page
just like the following,

map <F5> XXX-command

so, the "XXX-commad" how to do ?
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